Aiming device



Dec. 28, 1943. I Q ARNOLD 2,337,537

AIMING DEVICE Filed June 1, 1942 swam (b1 wyw w Patented Dec. 28, 1943 AIMING DEVICE Bryan C. Arnold, United States Army, Fort Shatter, Honolulu, Territory of Hawaii Application June 1, 1942. Serial No. 445,371 Claims. (Cl. 88-1) (Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757) The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

This invention relates to an aiming device which makes it possible for an instructor to concurrently observe the target on the same line of vision as the pupil firing. More particularly it is an object of the invention to provide such an aiming device which is adapted for ready attachment to a rifle.

To these and other ends, the invention consists in the construction, arrangement and combination of elements described hereinafter and pointed out in the claims forming a part of this specification.

A practical embodiment of'the invention is illustrated in the accompanying drawing wherein:

Figure 1 is a side elevaticnal view of the aiming device,

Figure 2 is an end View thereof,

Figure 3 is a top plan View thereof,

Figure 4 is a section on the line 1-4 of Fig, 1,

Figure 5 is a plan of the blank,

Figure 6 is a view similar to Figure 1 showing the device in position on a service rifle, and

Figure 7 is a top plan view of Figure 6.

Referring to the drawing by characters of reference, there is shown a container formed from a single blank rectangularly folded to provide a bottom i, sides 2 and 3, a top i and vertical ears 5 and B which are prolongations of the respective sides 2 and 3. The points at which the blank illustrated in Figure 5 is bent or folded are indicated by dotted lines. The lines a and a are those upon which the bends are made to form the sides 2 and 3, and the lines I) and b indicate where the slight bends are made to form the vertical ears or projections 5 and 8 offset from the sides 2 and 3. The line 0 is that upon which the bend is made to form the bottom I and the oblique line 11 is that upon which the operation is performed to provide th groove in the bottom of the casing that coacts with the diagonal groove in the top to hold the light-transmitting plate, the parallel dotted lines e indicating the position of the upper groove. The dotted line 1 indicates the location of the bend to form the downwardly extending lip shown in most of the figures, which serves, with other parts, to preserve the level of the completed casing, all as will more fully appear. The greater portion of side 3 i removed to leave a rectangular opening 7 for sighting. The ears '5 and 6 are joined to the sides through curved portions 8 and 9 which in the particular embodiment shown are adapted to fit the curved mount of a rifle. Ears 5 and 6 depend from curved joins 8 and S in straight lines H and I2 which clasp an abutment IS on the sight mount H), and the bottom portions l4, 15 of the ears are sloped corresponding to the slope ID in front of the mount.

Ears 5 and 6 are staggered slightly outward from the planes of sides 2 and 3 by double bends l6, ll which afford a purchase in front of the uprights i8 and it. The rear depending portion 20 on the bottom I maintains the instrument level.

Grooves 2| and 22 are stamped into the bottom I and top 5 at an approximately 45 angle and serve as guideways to receive a light dividing member 23 designed to transmit and reflect light incident at 45 in approximately equal proportions. A thinly silvered glass has been used to accomplish this in optical systems but for the practical usage here intended a dark pigmented glass is more suitable. However, it will be understood that any light transmitting member, such as plain glass, will function to some degree.

With the device clamped in place, the glass is behind the rear sight and a ray traversing the front and rear sights will be divided at the glass, part passing through to the gunner and part being reflected through the side opening to the eye of the instructor.

The device is lowered into place by depressing the ears 5 and 6 between thumb and forefinger. When the device has nested on the sight mount, the ears are released and the portions 8 and 9 spring back into engagement with the side guards it, Hi completing a snug attachment.

I claim:

1. An aiming device comprising a casing open at two opposite ends and of generally rectangular profile transverse to the direction between said two open ends, means in said casing to hold a plane member at an angle to the line between said open ends, an opening in one side of said casing adjacent the position of said plane member when the latter is in place, and integral forward extensions on two sides of said casing compressible toward each other by springing to engage the casing between fixed supports.

2. An aiming device comprising an integral four-sided substantially rectangular casing formed from a single folded blank, narrowed integral forward extensions of two opposite of the sides of said casing forming spring members for insertion between supports, grooves in the other two opposite of said sides formed at an angle to the planes of the first mentioned pair of opposite sides, said grooves being for the reception of a light-transmitting member and an opening in one of said first mentioned pair of sides adjacent said groove.

3. In a blank for an aiming device for attachment to a gun sight mount, a substantially flat body of springy material having three parallel fold lines, said lines being arranged to define, when the blank is folded, four interconnected body sections, the first section having a bifurcated projection and a substantially central curved space therebetween, a bend in the forward projection whereby the pair of projections are offset in parallel plane, the adjoining second and top-forming section having a depressed groove extending diagonally across the section, a forward projection on the adjoining third section extending in the same general direction as the forward projection on the first section and forming when the blank is folded, a U-shaped space therebetween, a bend in the third section whereby said section is offset in two parallel planes, the fourth and bottom-forming section being substantially triangular and having a depressed groove along the outer edge thereof and arranged when the blank is folded to be brought into parallelism with the groove in the top-forming section, the groove serving to support a light-transmitting member, and a protruding lip on another edge of said section arranged tobe bent down.- wardly when the blank is folded to serve as a leveling means for the device.

4. An aiming device comprising a casing open at two opposite ends, means in said casing to hold a plain light-transmitting member at an angle to a line between said open ends, an opening in one side of the casing adjacent the outer end of said member, when said member is in place, the 5 casing being provided with forwardly extending oppositely disposed extensions of springy material compressible toward each other for engaging the casing between two fixed supports, each extension being provided with a shoulder on its lower edge conforming to the upper surface of a portion of the gun sight mount, and a downwardly extending lip on the rear of the casing also for engaging with a portion of the gun sight mount and cooperating with said shoulders to preserve the level of the casing.

5. An aiming device comprising a casing with openings at two opposite ends and having a groove in the top at an angle to a line between its open ends, and a triangular rear bottom portion whose front edge is directly below and parallel with the groove in the top, said groov arranged to receive a plain light-transmitting member, an opening in one side of the casing adjacent the outer ends of said groove, said casing provided with forwardly extending oppositely disposed extensions of springy material compressib1 toward each other for engaging the casing between two fixed supports, said extensions each being provided with a shoulder on its lower edge conforming to the upper surface of a gun sight mount, and a downwardly extending lip at the rear end of the casing, also for engaging with the gun sight mount and cooperating with said shoulders to preserve the level of the casing.

BRYAN C. ARNOLD. 

